I've used an o-ring from the hardware store as a budget approach. This is the same thinking that led to try to talk my girl into using a vibrating toothbrush as a low cost makeshift (or travel) vibro. BTW I love the veiny effect of the o-ring. Just realised the marketing potential - O stands for Orgasm ...
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"Once made equal to a man, woman becomes his superior." Socrates
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